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:

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
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)
Like aleph in the central black squares of this puzzle's grid
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
Octet of black squares in the middle of this grid, typographically
1967 Box Tops hit about part of a puzzle answer grid?
New element whose name will be ratified in January, 2010, and whose symbol appears in the middle of this puzzle's theme answers
Row of black squares preceding or following six puzzle answers, thereby completing them
"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
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)
Second letters of this puzzle's five theme answers (seen in order)
Word that goes after the start of and before the end of the five longest answers in this puzzle
Words of reproach, and a hint to how the four longest puzzle answers are formed
Set of which all seven elements are fittingly hidden in the solved puzzle grid
It can precede the first names in six puzzle answers
Place where the starts of this puzzle's four longest answers result in a penalty
Item hidden in each of the 15-letter answers in this puzzle
Structure of this puzzle's theme, hidden in five answers
Result of not following through (of which there are four examples in this puzzle's grid)