The sign for senior uses the same finger as the number

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American Sign Language (ASL):

The sign for senior uses the same finger as the number...

10 (ten)

Explanation:

In American sign language, to make the word "senior", meaning a student´s fourth year in college or university, we have to perform a double movement, which ends with the dominant flat hand taping the tip of the thumb of the stationary non-dominant hand.

The thumb is also used to make the number ten, by shaking it left and right while pointing upwards.

answer; alsa'ada ;