sigil (i higil, o sigil), no distinct pl. form except with article (i sigil), coll. pl. sigiliath. (WJ:258) Note: a homophone means ”knife, dagger”.
Primitive elvish
firing
root. necklace
Noldorin
sigil
noun. necklace
Sindarin
sigil
noun. necklace
sigil
necklace
sigil
necklace
(i higil, o sigil), no distinct pl. form except with article (i sigil), coll. pl. sigiliath. (WJ:258) Note: a homophone means ”knife, dagger”.
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
Early Noldorin
fring
noun. necklace, necklace, [G.] carcanet
Early Quenya
firin
noun. necklace
Early Primitive Elvish
firiŋi Reconstructed
root. necklace
A hypothetical early root to explain words such as ᴱQ. firinga and G. fring “carcanet, necklace” (GL/36). The latter reappeared in Early Noldorin word lists from the 1920s as ᴱN. fring “necklace” (PE13/143), but in versions of the Silmarillion later in Tolkien’s life the Sindarin word for “necklace” was S. sigil (WJ/258). I think it is worth positing a Neo-Root ᴺ√FIRING to salvage some of these early words.
A word for “necklace” in the name Sigil Elu-naeth “Necklace of the Woe of Thingol” in Silmarillion notes from the late 1950s (WJ/258).
Conceptual Development: The Gnomish Lexicon of the 1910s had G. fring “carcanet, necklace” (GL/59), an element in the early name G. Nauglafring “Necklace of the Dwarves” (LT2/221). ᴱN. fring “necklace” reappeared in Early Noldorin Word-lists of the 1920s (PE13/143), but in Silmarillion drafts of the 1930s the “Necklace of the Dwarves” was renamed to Nauglamír (SM/135), a name it retained thereafter (S/114). The element mîr in the later name means “jewel” (Ety/MIR; LotR/1115), and Tolkien coined a new word sigil for “necklace” in the 1950s, as noted above.