What do a.m. and p.m. stand for?

reference mark

Surveying. a permanent mark set at a specific distance in a specific direction from a survey station so as to permit accurate reestablishment of the station.
any of various written or printed symbols, as an asterisk (*), dagger (†), or superscript number, used to indicate the presence of further information in a footnote, bibliography, or other text.
Origin of reference mark
1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for reference mark
  • Insert to fully seated position or to reference mark on pipe.
  • When its leading edge is tangent to the reference mark the clock time should be recorded.
  • The use of object reference mark-up allows many forms to be pre-populated with business data drawn from the business profile.
  • Some observations were made on existing benchmarks and some on special gravity survey disks and gravity reference mark disks.
  • As the water level in the inner ring reached the upper reference mark, a stop watch was started.
  • The time it took for the water level in the inner ring to reach the lower reference mark was recorded.
  • The reference mark will be corrected in an applicable revision, to be issued separately.

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