Acronyms: Is 2B the same as F4?

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Since we tend to use shorthand when describing various scenarios, do you find yourself sometimes confused what an acronym means? Here is a list of commonly used ones.  Oh, and the answer to the question is simple: 2B refers to a place (second base) while F4 refers to a person (second baseman). Makes sense right?

if you think of others, please comment.  We will update this list with new ones!

[/et_pb_text][et_pb_accordion admin_label=”Acronyms” _builder_version=”3.0.66″ border_style=”solid”] [et_pb_accordion_item title=”PU, BU, U1, U2: Umpires ” open=”on”]


Determining the base or plate umpire is easy: PU (plate) and BU (base umpire, also sometimes described as U1).  The base umpires can also be further described by location if more than 2-man crews.

  • If on a 3-man crew: U1 might be at first, and U2 might be at second.
  • If on a 4-man crew: U1 is at first, U2 is at second, and U3 is at third.
  • If on a 6-man crew: Add in L1 (or RL) = for an umpire placed on the right field line, and L2 or LL stationed on the left field line.


[/et_pb_accordion_item][et_pb_accordion_item title=”BR, R1, R2, R3: Batters and Runners”]


The batter is sometimes referred by his or her place in lineup: (B1, B2, B3…).  After that, once a batter hits the ball, they become a BR (batter-runner),  Once safely on base, BR is now a runner and is designated by the base occupied.  Therefore, R1 is on first, R2 on second, and R3 on third.

[/et_pb_accordion_item][et_pb_accordion_item title=”TOP / TOT: Time of Pitch / Time of Throw”]

In situations involving the base awards, you need to know whether the base awards are as of the “time of pitch” or “time of throw”. We will refer to these times as TOP or TOT.  Generally, award bases TOP when it is the first play by an infielder and TOT when it is the second play by an infielder or a play made by an outfielder.

For example:

  • The shortstop (F6) throws the ball wild into the dugout trying to get the batter runner (BR).  This usually means award 2 bases TOP (in other words: send the BR to 2B)
  • The right fielder (F9) airmails a throw into the stands on a play at third (3B). R3 would now score. Award and following runners (R1 and/or R2) two bases TOT if appropriate.

[/et_pb_accordion_item][et_pb_accordion_item title=”F1, F2, F3: Fielders”]

The ‘F’ refers to fielder.  The number refers to location on the field:

  1. Pitcher
  2. Catcher
  3. 1st Base
  4. 2nd Base
  5. 3rd Base
  6. Short Stop
  7. Left Field
  8. Center Field
  9. Right Field

Therefore, we call the catcher: F2 and the third basemen F5.

[/et_pb_accordion_item][et_pb_accordion_item title=”BOO: Batting Out of Order”]

Batting Out of Order

[/et_pb_accordion_item][et_pb_accordion_item title=”CBO: Batting Order”]

CBO refers to continuous batting order. CBO is required in all minor league games and can be used in all Little League games.

NOTE: The Ump Performance lineup cards are specifically designed to accommodate CBO or traditional batting order.



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