year count
/ˈjɪə ˌkaʊnt/ /ˈjəː ˌkaʊnt/noun
1A method for counting or reckoning years; a calendar; specifically the 365-day solar calendar used in pre-Columbian Meso-American cultures for civil purposes, in combination with a 260-day ritual calendar (now historical ).
2With reference to the practices of North American Indians, especially Plains Indians: a pictorial record or chronicle usually consisting of pictograms depicting the main event or events of each year, painted on an animal hide, piece of cloth, etc.
Origin
Late 19th century. From year + count.