List/Display all math constants and operators defined as Unicode symbols in Julia Base

mathsymbol.jl

# Credit of `math_symbols`: Tom Kwong (@tomkwong)
# Credit of `unicodesymbol2string`, `display_math_symbols`: Yi-Xin Liu (@lyxfudan) 
# 2020.08.31

using REPL: symbol_latex

function math_symbols()
    allnames = names(Base)
    name_length = [allnames length.(String.(allnames))]
    syms = filter(!(isascii ∘ String), name_length[name_length[:,2].==1, 1])
    return syms
end

function unicodesymbol2string(us)
    us = string(us)
    return isascii(us) ? us : isempty(symbol_latex(us)) ? us : symbol_latex(us)[2:end]
end

"""
Example: π can be typed by \pi<tab> in the Julia REPL or VS Code.
"""
function display_math_symbols()
    syms = math_symbols()
    cmds = unicodesymbol2string.(syms)
    for i in eachindex(syms)
        println(syms[i], "\t", cmds[i])
    end
    return nothing
end

display_math_symbols()