- Be concerned with first tick for missing word - Gem weight unit - Insertion mark - Mark indicating omission - Punctuation mark - A mark [^] used by writers and proof readers to indicate
that something is interlined above, or inserted in the margin, which
belongs in the place marked by the caret. - The hawkbill turtle. See Hawkbill.
- Aerial tracking system - Aircraft detection system - Aircraft tracker - Aircraft-locating system - Detection device - Direction finder - Echo-location