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One handed Sign Language
One handed fingerspelling is used by some sign language in the same way that BSL uses the two handed alphabet. For eg: ASL, Irish sign language, and many European sign languages.
Many signs naturally evolve from two handed signs into one handed signs simply because they are easier that way. For example "CAT" used to be a two handed sign and now is commonly done with one hand. The sign "thousand" evolve from the two-handed version into a one-handed version. Thousand went from touching an "M" hand to the palm, to touching a bent hand to the palm, and is now showing up as a bent hand jabbing forward/down at an angle without making contact with the second hand.
One handed signing is not "correct" because some people only have one hand. A one-handed sign become "correct" when a preponderance of ASL users recognize it and accept it into their vocabulary.
One handed Chart
The ASL alphabet is based on French sign language and was standardized by Thomas Gallaudet and Laurent Clerc for use in America.
It is also used in Germany, Austria, Norway, and Finland, again with a modification for the letter T. T is like G with the thumb placed atop the first knuckle of the index finger.
German Ä, Ö, Ü, and ß are signed like A, O, U, and S but with a downward motion, while SCH is a 5 hand (palm forward). In Norwegian and Finnish, the letters Ä, Å, Ö, Ø are derived by moving A and O (in the case of Å, in a small window-washing circular motion), and it is the Æ that gets the 5 hand (perhaps somewhat flexed).
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