SharePoint 2013 and SharePoint 2010 display identity claims with the following encoding format:

<IdentityClaim>:0<ClaimType><ClaimValueType><AuthMode>|<OriginalIssuer (optional)>|<ClaimValue>

Where:

• <IdentityClaim> indicates the type of claim and is the following:
  • “i” for an identity claim
  • “c” for any other claim
• <ClaimType> indicates the format for the claim value and is the following:
  • “#” for a user logon name
  • “.” for  an anonymous user
  • “5” for an email address
  • “!” for an identity provider
  • “+” for a Group security identifier (SID)
  • “-“ for a role
  • “%” for a farm ID
  • “?” for a name identifier
  • "\" for a private personal identifier (PPID)
• <ClaimValueType> indicates the type of formatting for the claim value and is the following:
  • “.” for a string
  • “+” for an RFC 822-formatted name
• <AuthMode> indicates the type of authentication used to obtain the identity claim and is the following:
  • “w” for Windows claims (no original issuer)
  • “s” for the local SharePoint security token service (STS) (no original issuer)
  • “t” for a trusted issuer
  • “m” for a membership issuer
  • “r” for a role provider issuer
  • “f” for forms-based authentication
  • “c” for a claim provider
• <OriginalIssuer> indicates the original issuer of the claim.
• <ClaimValueType> indicates the value of the claim in the <ClaimType> format.

Here are some places in SharePoint where you will see claims encoding (please add to this list):

• In the display of user sign-in information on a SharePoint 2010 or 2013 web site (For example, on a SharePoint 2013 team site page, click your user name in the upper-left corner, and then click My Settings. The Account field uses the claims encoding.)
• In the "Authentication Authorization" log entries in the Unified Logging Service (ULS) log files for SharePoint 2013

 Here are some examples (please add your own based on your experience):