A simple Perl script for your Unicode symbols:
#!/bin/perl
use warnings;
use utf8;
use strict;
use v5.16;
use charnames qw(:full);
use File::Basename;
binmode(STDOUT, ':utf8');
use feature 'say';
$0 = basename $0;
@ARGV or do {
say STDERR "Usage $0 <symbol name>";
say STDERR "Example: $0 GREEK CAPITAL LETTER SIGMA";
exit 1;
};
say chr charnames::vianame("@ARGV");
It is easy to have symbols on your terminal emulator. As easy as installing a symbol font like this:
https://fedoraproject.org/wiki/Gdouros_Symbola