Re: In base 1, the number after 0 is:

[kcott]

A Thumb!

I checked it: zero was a fist; 1₁₀ was a thumb; 2₁₀ was a thumb and forefinger; ...

Unfortunately, the options:

• Thumb
• Other
• None of the above

were all missing, so I wasn't able to vote in this poll. :-(

[FloydATC]

Deaf people have improved this slightly :-)

They consider a hand with only the thumb extended to mean "6", while the index finger means "1". Zero is signed by forming a round shape using the thumb and index finger. This way they can sign the numbers 0 .. 9 using one hand only.

[lidden]

How do they do 5? Did you mean 5 when you typed 6?

[FloydATC]

"5" is your hand with all fingers extended, "9" is all fingers except the pinky extended.

"10" is signed "1" then "0".

[chacham]

You could always repurpose -0. It's not like it means something specific anyway. :)

[kcott]

Well, OK. But I think -0 looks more like roboticus' thumb than mine. :-)

Just to explain that quip, ...

roboticus' signature has, for a very long time, been:

"When your only tool is a hammer, all problems look like your thumb."