^g: muted conversations (just like is:muted or label:muted or label:mute)^p: messages marked as phishing^op: messages automatically marked as phishing by Gmail^os: messages automatically marked as spam by Gmail^vm:
Google Voice voicemail messages (just like is:voicemail or label:voicemail)^io_im: important messages (just like is:important)^unsub: messages that include unsubscribing options. Gmail offers to unsubscribe on your behalf^cff: messages from your Google+ circles (just like has:circle)^p_esnotif: Google+ notifications
