Unicode posted in its errata page [1] that they will be updating the representative glyph for U+033B COMBINING SQUARE BELOW, which is the IPA symbol for laminal articulation (and whose shape is a rectangle in IPA charts). For more information, see [2]. [1]: http://www.unicode.org/errata/ [2]: http://www.unicode.org/L2/L2016/16178-ipa-laminal.pdf
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