Sip is the third of the nineteen periods of the Haab, the 365-day Maya solar calendar. Recorded here by its Yucatec name, Sip, with the gloss of the red conjunction, the month is known from the colonial sources and, in its Classic glyphic form, from the inscriptions. In Yucatec tradition Sip is associated with a deity of the hunt, and the month carried hunting observances. Like each of the eighteen full months it counts twenty days, a Maya date naming the day by its place within the month alongside its Tzolk'in day sign and number. These are the features of the Maya solar calendar, built of eighteen twenty-day months and a closing five-day period, which together with the 260-day sacred count forms the interlocking system the Calendar Round completes every fifty-two years.
Sip, also transcribed Zip, is the third month and shares its name with Zip, a Yucatec deity or class of deities associated with deer and the hunt, appearing in colonial accounts as a guardian spirit hunters were expected to propitiate before taking game. Diego de Landa records a ceremony conducted around this part of the year in which hunters and physicians honoured their respective patron figures and purified their tools, though as with the other months the precise date and the boundary between one month's rites and the next are better attested in Landa's general description than in a month-by-month inscriptional record. The recurrence of hunting imagery in the month's glyph in some Classic inscriptions is consistent with, though not conclusive proof of, a continuity between the Classic-period and colonial-period associations of the name.