Quint

A grouping that consists of five identical tiles. 

Joker tiles are allowed and up to five Joker tiles can be used in this grouping, depending on how the grouping is exposed. 

If the exposure occurs due to claiming a discarded tile the exposure can contain up to four (4) Joker tiles. 

If the exposure occurs due to a player declaring Mah Jongg and exposing all of their tiles, the exposure may contain up to five (5) Joker tiles. 

Only the Flower tile has more than four identical tiles therefore all quints, except a quint of Flowers, must contain at least one Joker tile.