18.

⒙ U+2499, ⒙ NUMBER EIGHTEEN FULL STOP ← ⒘ [U+2498] Enclosed Alphanumerics ⒚ → [U+249A]

Icelandic

Icelandic numbers ^(edit)

←  17	18	19  →
Cardinal: átján     Ordinal: átjándi     Ordinal abbreviation: 18.     Fractional: átjándi

Adjective

18. (indeclinable)

1. 18th