I - Forms

Forms

See also: History of the Latin alphabet

In some san serif typefaces, the upper case letter I ⟨I⟩ may be difficult to distinguish from the lower case letter L ⟨l⟩, the vertical bar character ⟨|⟩, or the digit one ⟨1⟩. In serifed typefaces, the capital form of the letter has both a baseline and a cap-height serif, while the lower case l has generally a hooked ascender and a baseline serif.

The upper case I does not have a dot (tittle) while the lower case I has it in the most of Latin-based alphabet schemes. However, some schemes, such as the Turkish alphabet, have two kinds of I's: the dotted one (İi) and the dotless one (Iı). For further information, see Dotted and dotless I.

The upper case I has two kinds of shapes, which are one with crossbars and without crossbars . Usually, they are considered same, but they are distinguished in some extended Latin alphabet system such as the 1978 version of the African reference alphabet. In the system, the former is the upper case counterpart of ɪ and the latter is the counterpart of i.

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