= Mathematical delimiter
A \b[mathematical delimiter] is a symbol used to enclose or separate parts of a mathematical expression, such as parentheses, brackets or vertical bars. Its visible size should suit the enclosed material. <Mathematical typesetting> can select a larger <mathematical glyph variant> or construct a <mathematical glyph assembly> when a default <glyph> is too small.<MATH - The Mathematical Typesetting Table by Microsoft>[MathVariants and MathGlyphConstruction: ready-made variants and assemblies for growing shapes]{ref}
For example, compare the grouping in
$$
\left(\frac{x+1}{y}\right)^2.
$$
The parentheses enclose the complete <typeset fraction>, so its height and depth inform their layout. The <superscript> applies to the grouped expression. In <TeX>, `\left(` and `\right)` request paired size-sensitive delimiters around the enclosed material. The stored parenthesis characters can therefore yield different <glyphs> in different formula contexts.
The <Math axis> provides a useful alignment reference for symmetric enclosing shapes. A font's choice of larger variants or assembly parts can preserve appropriate stroke weights and proportions while the expression grows.
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