the equal sign
=
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It is a prefix which means two.
They had a symbol for zero and understood its importance in mathematical calculations.
Lambda is usually specified to mean wavelength in mathematics and physics.
The symbol for reciprocal is an overlapping set of horizontal arrow points with the number inside. It is a hard symbol to describe. Here is a link to a picture of what the symbol looks like: https://sites.google.com/site/earthenrevolution/_/rsrc/1302560572526/mathematics/reciprocal%20symbol.png
The symbol for the set of integers is Z. This comes from the German Zahl, which means integer.