Someone asked me what do I meant when I said "Japanese Sign Language has gender, like German, and unlike German Sign Language which is gender-free like Japanese". Answer:
It's very interesting—the thumb is the "male" finger, and the pinkie is "female". You commonly use this as a suffix, by signing something like "person" or "doctor" then extending a closed fist with the intended gender finger. This suffix is bound and doesn't occur by itself. Some signs also incorporate it as something akin to inflection or compounding—compare the sign for "lesbian":
https://media.spreadthesign.com/video/mp4/7/339768.mp4
with "gay":
https://media.spreadthesign.com/video/mp4/7/350084.mp4
I was once with a bigender person and I suggested them that their gender could be represented by extending both fingers in Japanese Sign Language (my flirting technique remains flawless). Alas, in actual JSL, extending both fingers represents "a mixed-gender group", or, often, "a hetero/married couple". So the sign for "society" can be inflected with the thumbs to represent "all men" or with both fingers for "all people", for example. And the individual fingers can be used as sort of little puppets representing someone in particular, as a gendered pronoun, moving through visual space and interacting with one another etc. Check out p. 22-23, fig. 2-12b on Pedersen/Masumi 2019:
https://minpaku.repo.nii.ac.jp/record/8323/files/SES101_02.pdf
for a fascinating example where "marriage" gets modded into "female-dominant marriage" with a submissive little thumb bowing well bellow the proud, tall dominating pinkie.