I haven’t scratched much past the surface and am still learning, but it doesn’t seem inundated with Norse themed anything, which I enjoy that it isn’t that way. I generally hate the trend of catchphrase derived language/library.
That’s it. Enjoy your stay in Valhalla 
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Also, I think rune is actually inherited from Go, which uses the same name. I don’t think it’s even intentional theming, it just worked out that way.
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A rune is the glyph a unicode code point number designates. It’s slowly standardizing across the programming industry. It’s only connection to Odin is the choice to use the increasingly common term.
You generally don’t call unicode glyphs “characters” because character is generally understood to mean a single 8-bit byte. Thus, the term “rune” for a multi-byte unicode glyph.
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This is great, I had no idea. Been in java-space too long
A font can actually contain multiple glyphs per codepoint (or rune in Odin terms) so you also can’t use the term glyph.
Rune is a bad term in my opinion, not just because the popularity of bad adaptions of Norse mythology in pop culture but also because it is just use as an alternative word for character, but it is probably the best we have.
There are graphemes and grapheme-clusters, which may contain one or more code points (or a multi-rune), to define a single mono-space character. Rune is just a subset (or simplest set) of a larger set of possibilities. From my view, glyph is a generic word to refer to any mono-space pic-to-gram albeit a letter, word or idea, depending on the language.
See core:unicode
import "core:unicode/utf8"
graphemes, runes, width := utf8.grapheme_count("öá")