Chauvisi (चौवीसी) means the set of 24 Tirthankaras of the current time cycle. “Lanchhan” are their the emblem/symbols. When someone says “next Chauvisi with lanchan,” they are talking about listing the 24 Tirthankaras in order and noting each one’s lanchhan.

• In Jain tradition, the 24 Tirthankaras and their lanchhan are given in Chaityavandan/Chauvisi texts. The lanchhan can differ a little between Śvetāmbara and Digambara traditions, but the core 24 names are common.

• Example from the Chaityavandan/Chauvisi material: the 23rd Tirthankara in one Chant (Anagat Chovisi) is Anantvirya Swami, and his lanchhan is the makara (sea-makara/river-makara symbol). This shows how lanchhan are attached to each Tirthankar in that Chauvisi section. ( jainknowledge.com)

• Another related note: many people refer to the “First Chovisi” as the current cycle’s 24 Tirthankaras (Rishabhanath through Mahavira) and describe their lanchhans in sequence. You can find lists and discussions of the 24 Tirthankaras and their symbols in Jain knowledge resources that cover Chauvisi. ( jainknowledge.com)

If you’d like, I can share the exact text for a specific Chauvisi entry with its lanchhan (for example, the 23rd Anantvirya Swami or another Tirthankar) in a simple, clear form. I can also provide the opening lines of the Chauvisi section and identify the lanchhan for each Tirthankar you’re interested in.

You can read more here and here