It would catergorize under literacy. Elrohir and Elladan (The Twins Stars of Imladris) are the twin sons of Lord
Elrond. To those who havent' read Lord of the Rings, but seen the movie,
Elrond is the Elf with the big forehead who holds the council in Rivendell and does that freaky eye-brow thing when
Merry and Pippin jump in.
Elrohir = elf-knight, elf-rider. It is also possible to translate this as star-knight/star-rider, which is charming, but there is no evidence that Tolkien intended this translation.
Elladan = Elf-man. This seems boring until we analyse the etymological significance of the word “dan”. Strictly speaking, it means "man." In usage, it means Númenorean, advanced man, wise man, as in Dúnedain. There is also overlap with the word “dan” meaning “wright or smith”. (Círdan [singular name, ship-wright] Mírdain [plural name, jewel-smiths]). So the highest, most knowing sort of man is what is implied here – a man of lore and craft, significant ideas in the Tolkien universe.