Are Unicode characters a problem for the tools you use? For example, some languages will let you use λ instead of lambda. Or when trying to define the logistic

Are Unicode characters a problem for the tools you use? For example, some languages will let you use λ instead of lambda. Or when trying to define the logistic function, I sometimes find myself writing σ(x) = 1.0 / (1.0 * exp(-x)) Or the Julia language has ≈, which tests if two floating point numbers are approximately equal. Visually, this is a reasonable symbol, it's not like one of the weird functional programming spaceship operators. But I have no idea what a screen reader would read. Sometimes this sort of thing lets code correspond almost exactly to the notation in papers. It is a minor aesthetic improvement, but if it breaks screen readers and other tools I'd rather just write out "sigma" or "lambda".