Common interface that is a model for several squares in this puzzle

Question:

Answer:

TELEPHONEKEYPAD

Length:

Similar Crossword Questions:

Landmark inaugurated 3/31/1889 whose shape is suggested by nine squares in this puzzle's completed grid
What the six puzzle answers graphically represented in this puzzle have in common
Company "sorted" in this puzzle's circled squares
Complete set of 12 shapes formed by this puzzle's black squares
Common standard for model railroads
Question asked by a customs officer or a kid on Christmas ... with a hint to this puzzle's circled squares
Common purchase of this puzzle's theme
Hardly a model of perfection, and a hint to how this puzzle's theme puns are derived
What the highlighted squares in this puzzle represent
Like some crossword-puzzle squares
Common computer interface
Secret get-together, or what occurs literally in each of this puzzle's circled squares
Alice Walker novel ... or a hint to 12 squares in this puzzle
Role model hidden in this puzzle's longest answers
Welcome mat spot (our puzzle title hints at the theme revealed by the pattern of circled squares)
Trains, in a way, and the key to 18 of this puzzle's black squares. (Ones that begin with the keyword are asterisked. The others are for you to discover.)
Gather wealth by exploitation ... as hinted at by this puzzle's circled squares?
Puzzle based on Latin Squares
Off one's rocker, and a hint to what the four longest puzzle answers have in common
What Thoreau and Eisenhower have in common, or this puzzle's theme, literally
What's been deposited in four squares of this puzzle, expressed both by name and by symbol
Row of black squares preceding or following six puzzle answers, thereby completing them
Start of a brainteaser whose answer appears in order, from top to bottom, in this puzzle's circled squares
Economic term named the 2011 Word of the Year by the Oxford English Dictionary...and a description of 6 squares in this puzzle
What this puzzle's seven longest answers have in common