These include: Of these, only 〆 for 締 and ヶ for 箇 are generally recognized as being simplifications of kanji characters.
Other examples include simplifying 醤油 shōyu (soy sauce) to 正油.
Using 卆 in isolation, such as when writing 新卒 shin-sotsu "newly graduated" as 新卆, is unofficial ryakuji.
Thus simplifying the 専 in 薄 (bottom part 溥) to 云 is found in ryakuji.
A conspicuous informal example is 喜→㐂 (3 copies of the character for 7: 七), which is rather frequently seen on store signs.
Other examples include 鹿→𢈘; and replacing the center of 風 with two 丶, as in the bottom of 冬.
Some ryakuji are simplified phono-semantic characters, retaining a radical as semantic and replacing the rest of the character with a katakana phonetic for the on reading, e.g., 議 (20 strokes) may be simplified as 言 (semantic) + ギ (phonetic gi for on reading): Another example is 層 sō, replacing the 曽 by ソ so.
Similarly, 慶應 (Keiō) as in Keio University may be simplified to "广K广O": the letters K and O respectively placed inside the radical 广.