The 2x2 black square near the middle of this puzzle's grid, e.g., which is part of eight answers

Question:

Answer:

BLOCK

Length:

Similar Crossword Questions:

A type of one appears in each part of this puzzle's longest answers
Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers
Game that can follow the first part of this puzzle's four longest answers
New element whose name will be ratified in January, 2010, and whose symbol appears in the middle of this puzzle's theme answers
"Hmmmmm ..." [as hinted at by the three groups of black squares in the middle of the grid]
Web concerns ... and based on six familiar names hidden in rows 1, 4, 12 and 15 of this puzzle grid, what the black squares in those rows symbolize
On hold ... or what the seven rows of black squares in this puzzle's grid spell in Morse code
Subject of an annual March 14 celebration and of this puzzle, celebrated in both a literal and a numerical way in the first square of the starred answers, reading left to right
Row of black squares preceding or following six puzzle answers, thereby completing them
Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
Like aleph in the central black squares of this puzzle's grid
Black Friday destination found in nine of this puzzle's Across answers
Worries, and word anagrammed in part of four puzzle answers
Last letter in most plurals (but not in this puzzle's six longest answers, which are the only plurals in this grid)
Octet of black squares in the middle of this grid, typographically
1967 Box Tops hit about part of a puzzle answer grid?
Easy, and what this puzzle's theme answers literally are
Word separated in this puzzle's six longest answers
They swing up and down in this puzzle's theme answers
Simple substances split in eight long answers in this puzzle
Letter that, as it appears in the middle of this grid, can precede the first words of the starred entries
Nanobot's hypothetical ability, and the process that's overtaken this puzzle's theme answers
List shortener hidden in eight long puzzle answers
Square part of a square meal?
Breaks ... or an anagram of the ends of five Across answers in this puzzle