Mark Lipof blows a shofar during the lead-up to Yom Kippur at Temple Ohabei Shalom in Brookline, Mass., in 2010. Michael Fein/MediaNews Group/Boston Herald via Getty ImagesIt’s the Jewish High Holiday season, and Jews the world over are preparing to visit their local synagogues – for community, for prayer, and to hear the arresting, soulful sounds of the shofar.An animal horn – typically a ram’s horn – used as a wind instrument, the shofar is featured over 70 times in the Torah. In ancient Jewish tradition, horns were sounded for everything from calls to action to royal coronations. In the spirit of both, the Bible calls upon Jews to raise forth shofar blasts on Rosh Hashana, which literally means the “head,” or start, of the year. The holiday is a time of communitywide soul-searching. Beyond marking the Jewish new year, it also commemorates the world’s birthday, the creation of humans, and the sovereignty and majesty of God. Marking the start of the High Holiday season, Rosh Hashana kicks off a 10-day period of reflection that culminates in Yom Kippur, the Day of Atonement, whose last moments are also marked by the shofar’s call. According to the Talmud, a central collection of rabbinic teachings on Jewish law and theology, three divine books are opened on Rosh Hashana. Each person is inscribed into one of the three: one book for the righteous, one for the wicked and one for those in between, who are given till Yom Kippur to set their hearts straight. Rabbis say the shofar’s sounds cause God to move from his “throne of judgement” to his “throne of mercy.” They also say that shofar sounds can penetrate human hearts, prompting them toward repentance – while mimicking the broken-hearted cries of someone recognizing just how much they need to repent. A Jewish man preparing for Rosh Hashana tests the sound of a shofar before buying it. Menahem Kahana/AFP via Getty Images As a scholar of Jewish tradition, I’ve worked extensively on the downright esoteric writings of Moses Maimonides, a 12th-century Jewish philosopher. When it comes to the meaning of the shofar’s call, though, Maimonides offers a refreshingly down-to-earth take in the Mishneh Torah, his guide to Jewish law: “Wake up you sleepy ones from your sleep and you who slumber, arise. Inspect your deeds, repent, remember your Creator.” Sonic-spiritual pauseThe sound of the shofar is uniquely rich and searching, somewhere between a human cry and an otherworldly hum. It fills the room as well as one’s entire body – inviting a moment of pause, of existential reckoning. During the High Holidays there are three varieties of shofar blasts, which are combined into a series of sound constellations throughout the prayer service.The first kind of blast is a single, solid sounding called “tekiah.” This one also comes in a “tekiah gedolah,” or “big tekiah,” version that stretches on for a longer stint. The second sound pattern is called “shevarim,” made up of three medium blares. And the third is called “teruah,” consisting of at least nine staccato soundings – or, for Jews of Yemenite heritage, another single tone.The shofar is sounded throughout the two days of Rosh Hashana – in some congregations, 100 times per day. The constancy and repetition enhance the sounds’ capacity to engage participants’ minds, hearts and spirits. Three types of shofar blasts are combined during High Holiday services. Sourcing shofarsTo make a shofar, a horn is boiled to soften its innards for removal. Using heat to straighten part of the horn, the craftsman carefully drills a hole and carves a mouthpiece at one end. Heat can be used to further straighten the horn, and the finish can range from natural to polished. As for the species and shape of shofars, there are differences of opinion – and of culture. Amid rabbinic debates over straight shofars or curved ones for Rosh Hashana, Maimonides says only a curved ram’s horn will do. Jews of Yemenite heritage use the kudu antelope, whose spectacularly long horns produce a strikingly deep sound. And the “Moroccan shofar” is said to have emerged during the Spanish Inquisition: Because Jews needed to hide their shofars to avoid persecution, they were crafted to be flat and straight.The hollowness of the shofar is what produces its unique sound, so it needs to be made of a horn, not an antler. And it will need to come from a kosher animal, an animal permissible to eat under Jewish law – which, for land animals, means having split hooves and chewing its cud.On both counts, only certain animals will do, including goats, antelopes and rams. And regardless of the kind of shofar it is, it takes some practice to get a sound to come out of it at all. Rabbi Carolyn Braun plays a shofar during a ceremony at The Cedars retirement community in Portland, Maine, in September 2013. Carl D. Walsh/Portland Press Herald via Getty Images Holy covenantThe popular use of rams’ horns is also a nod to the biblical story of the binding of Isaac, which is traditionally read during Rosh Hashana services.According to the Book of Genesis, God commanded Abraham to sacrifice Isaac, his beloved son. After nearly going through with the killing, Abraham has a heavenly vision in which he is thanked for his loyalty to God and instructed to spare Isaac after all. Abraham sees a ram caught in a nearby thicket, which he sacrifices to God instead. The next verses describe God blessing Abraham and all his future descendants – which Jews read as a key moment in their identity as a people.In the Talmud and across a number of other Jewish texts, blowing a ram’s horn for the new year invokes this same redemptive energy: God’s willingness to watch over not just Abraham and Isaac but the entire Jewish community, in a spirit of mercy and blessing. Using a bull’s horn as a shofar, on the other hand, doesn’t fly. Rabbis rule it out because the term for a cow horn in the bible is “keren,” not “shofar.” The bull’s horn is also seen as too much of a reminder of another key story from the Torah: the Sin of the Golden Calf.As the Book of Exodus describes it, God led the people of Israel out of slavery in Egypt. He then shares that he would reveal his law to them as a form of everlasting covenant, working through Moses as his spokesperson.To make the point, God called Moses up to Mt. Sinai, accompanying him in the form of thunder, lightning and fire. Together with pillars of smoke, and louder and louder shofar blasts, the experience left the people awestruck. While details are debated, the text says that they then assented to God’s law – including the commandment not to worship idols.Yet when Moses heads back to the mountaintop, the Israelites fear he’s abandoned them. Eager for immediate spiritual support, and in spite of having just agreed to God’s law, they built a bovine idol and proceed to worship at its feet. God considers destroying the people. Yet Moses reminds God of the promise to protect Abraham and his descendants – a direct loop back to the binding of Isaac.What’s in a wordIt appears that the origin of the term “shofar” is “šappāru,” a word in the Akkadian language of the ancient Near East that originally referred to types of rams, deer or wild goats. But there is also a rabbinic commentary connecting the word “shofar” to the Hebrew term for beauty and improvement – suggesting the shofar inspires people to beautify their souls, aligning their actions with their values.Regardless of the historical etymology of the word, this reading certainly captures the tenor and texture of hearing the shofar during the High Holidays. Its sounds inspire Jews to take spiritual inventory, surveying where the previous year has led them and planning the paths upon which they will next embark.Sarah Pessin does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.