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Form A describes a relay whereby the contact is a simple switch, which is open or closed, and the un-energised position is the open condition. For a single relay this would also be described as a single pole, single throw (SPST) relay with a normally open (NO) contact.
If the relay has multiple contacts in the same package it would be described as having (for example) 2 Form A contacts (DPST).
Pickering has a range of Form A Reed Relays, for example our Series 109 that are an ideal choice for high density applications, or our high voltage Series 104 for up to 3kV.