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In page International Phonetic Alphabet:

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The basic Latin inventory was extended by adding small-capital and cursive forms, overlapping diacritics such as hooks, and rotation. The sound values of these letters are related to those of the original letters or to those of letters that they were modified to resemble.[note 1] For example, rotated letters were popular in the era of mechanical typesetting, as they had the advantage of not requiring the casting of special type for IPA symbols, much as the sorts for ⟨b⟩ and ⟨q⟩, ⟨d⟩ and ⟨p⟩, ⟨n⟩ and ⟨u⟩, and ⟨6⟩ and ⟨9⟩ had traditionally often pulled double duty to reduce printers' costs.[citation needed] Thus rotated ⟨ɐ ə ɹ ʍ⟩ recall a e r w, while rotated ⟨ɔ ɟ ɓ ɥ ɯ ʌ ʎ⟩ recall o j b y u/w ᴀ y/λ.[note 2]