Terminology

All examples are in the QWERTY layout.

SFB

Stands for Same Finger Bigram. Describes when the same finger is used to press two keys. Example: ED

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SFS/dSFB

Stands for Same Finger Skipgram/disjointed Same Finger Bigram. Describes when the same finger is used to press two keys, but, there is another key in between that does not use the same finger. Example: GOT

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Alternation

Describes when a series of keys are pressed by opposing hands one after another. Example: LAKE

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Redirect*

Describes key sequences against a common direction on one hand. Example: YOU

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Weak/Bad Redirect

Describes key sequences against a common direction not involving an index finger on one hand. Example: SAD

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Roll

Describes two key presses on the same hand with different fingers, followed by another keypress on the opposing hand. Example: POT

Inroll/Outroll

Describes a type of roll; Inrolls involve the two key presses "moving" towards the center of the keyboard, while outrolls involve the two key presses "moving" away. Example: POT (in) vs OPT (out)

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Onehand/3Roll

Describes three key sequences moving in the same direction on one hand. Can also be described as in or out. Example: JKL (in) vs LKJ (out)

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LSB

Stands for Lateral Stretch Bigram. Describes two keys being pressed by adjacent fingers, but requires a horizontal stretch of one key length (or more) between the fingers. Example: ET

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Scissor**

Describes two keys being pressed by adjacent fingers, but requires the fingers to be apart by one row. Does not apply to the index finger.Example: WZ

Half Scissors***

Describes two keys being pressed by adjacent fingers, but one finger is on the homerow while the other is not. Example: DR

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nU ___

Describes a special varient of some terminology that extends beyond one key length. Example: 2U SFS = SFS that requires the repeated finger to move two key units, 1.6U LSB = LSB that requires a 1.6U separation between the fingers, etc.

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Corpus

Describes a given set of characters whether that be words, sentences, or entire books.

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Alt Fingering

Describes the act of pressing certain keys with atypical fingers due to better efficiency or comfort. Example: Pressing R with the middle finger and E with the ring finger in "GREAT".

Additional Notes

*Redirects have debated effects.

**Scissors have debated effects.

***Most do not consider as an issue; primarily a "nice to have."