Define [=WebAuthn signature=]

index.bs

@@ -2701,7 +2701,7 @@ The [=public key credential=] type uses certain data structures that are specifi
 follows.
 
 
-### Client Data Used in WebAuthn Signatures (dictionary <dfn dictionary>CollectedClientData</dfn>) ### {#dictionary-client-data}
+### Client Data Used in [=WebAuthn Signatures=] (dictionary <dfn dictionary>CollectedClientData</dfn>) ### {#dictionary-client-data}
 
 The <dfn>client data</dfn> represents the contextual bindings of both the [=[WRP]=] and the [=client=]. It is a key-value
 mapping whose keys are strings. Values can be any type that has a valid encoding in JSON. Its structure is defined by the
@@ -2964,7 +2964,7 @@ made by that manufacturer, and different (with high probability) from the AAGUID
 The AAGUID for a given type of authenticator SHOULD be randomly generated to ensure this. The [=[RP]=] MAY use the AAGUID to infer certain
 properties of the authenticator, such as certification level and strength of key protection, using information from other sources.
 
-The primary function of the authenticator is to provide WebAuthn signatures, which are bound to various contextual data. These
+The primary function of the authenticator is to provide [=WebAuthn signatures=], which are bound to various contextual data. These
 data are observed and added at different levels of the stack as a signature request passes from the server to the
 authenticator. In verifying a signature, the server checks these bindings against expected values. These contextual bindings
 are divided in two: Those added by the [=[RP]=] or the client, referred to as [=client data=]; and those added by the authenticator,
@@ -3001,6 +3001,7 @@ Authenticators produce cryptographic signatures for two distinct purposes:
     provided, and the prompt shown to the user by the [=authenticator=]. The [=assertion signature=] format is illustrated in
     [Figure 4, below](#fig-signature).
 
+The term <dfn>WebAuthn signature</dfn> refers to both [=attestation signatures=] and [=assertion signatures=].
 The formats of these signatures, as well as the procedures for generating them, are specified below.
 
 ## Authenticator Data ## {#sctn-authenticator-data}