Normally it is = which is an equality sign
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The plus symbol, "+", is used to indicate an addition.
This
Pi ( π ) - used in geometry: ratio of cirle's circumferenct to diameter.Theta (θ) - symbol used in trigonometry, to indicate an angle measurement in degrees.Sigma (Σ) - used in math for summation of a series.Delta (Δ) - used to indicate a change in something.There may be others that I haven't listed. There are many more Greek letters used in the different science fields. Hope that helps.
The symbol used to indicate a nonnegative square root.
There's no specific symbol apart from the 'm' in $1m, which is just short for million.