List of email subject abbreviations - Wikipedia
https://en.wikipedia.org/wiki/List_of_email_subject_abbreviations
OverviewOther English abbreviationsStandard prefixesNon-standard infixes and suffixesSoftware developmentAbbreviations in other languagesSee also This is a list of abbreviations which are less commonly used in the subject of an English email header: • AEAP, meaning As Early As Possible.• ASAP, meaning As Soon As Possible.• AB, meaning Action By. Used with a time indicator to inform the recipient that the sender needs a task to be completed within a certain deadline, e.g. AB+2 meaning Action By 2 days.
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