6.3 Tate-chu-yoko (縦中横)

Synopsis

Tate-chu-yoko ("horizontal-within-vertical") sets a short run — typically multi-digit numbers or Latin initialisms — upright and horizontal inside vertical text, so e.g. 24 reads as a unit rather than two stacked digits.

Notation

A forward-reference directive names the run:

昭和二十四年は西暦19［＃「19」は縦中横］24［＃「24」は縦中横］年。

tcy = LBRACK HASH LQUOTE target RQUOTE %s"は縦中横" RBRACK

Parameters

• target — the quoted run to rotate. It is resolved against the preceding text by the look-back rule (§7.5).

Semantics

• The directive resolves its target (§7.5) and yields a tate-chu-yoko node over the matched run.
• Reference rendering (§8) is <span class="aozora-tcy">…</span>.
• Serialization reconstructs the directive (and the literal target it follows) byte-exact (§7.6).

Error conditions

• Target not found — a target absent from the look-back raises tcy-target-not-found (warning); the directive degrades to a generic annotation (§6.14).

Conformance vectors

tate_chu_yoko.