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Keyboard glossary

1A
Single Pole Single Throw Normally Open
1B
Single Pole Single Throw Normally Closed
2A
Double Pole Single Throw Normally Open
A/W
(On PCBs from Alps USA and Hi-Tek) Artwork (confirmed from a keyboard where it was written out in full)
DPDT
Double Pole Double Throw
DPST
Double Pole Single Throw
Form A
Single Pole Single Throw Normally Open (also written 1A, especially by Cherry) or simply Normally Open
Form B
Single Pole Single Throw Normally Closed (also written 1B, especially by Cherry) or simply Normally Closed (also written 1A)
NC
Normally Closed
NO
Normally Open
PWB
(On PCBs from Alps USA and Hi-Tek) Likely “Printed Wiring Board”
SPDT
Single Pole Double Throw
SPST
Single Pole Single Throw