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| Date | Grid | Clue | Author |
|---|---|---|---|
| Sunday, February 17, 2013 | 1A | Summation symbol in math (2) | Ian Livengood and J.A.S.A. Crossword Class |
| Tuesday, April 17, 2012 | 51D | Summation symbol in math (2) | Milo Beckman |
| Monday, April 2, 2012 | 9D | Greek "S" (2) | Lynn Lempel |
| Sunday, January 22, 2012 | 27A | Head of ancient Sparta? | Adam Fromm |
| Tuesday, June 21, 2011 | 59A | Summation signifier, in math | Kelsey Boes |
| Thursday, November 19, 2009 | 6A | Symbol in a Riemann sum | Tyler Hinman and Jeremy Horwitz |
| Tuesday, September 29, 2009 | 51D | Summation symbol | Paula Gamache |
| Sunday, March 15, 2009 | 109D | Arithmetic series symbol | Patrick Berry |
| Saturday, November 4, 2006 | 25D | Standard deviation symbol (4) | Rich Norris |
| Tuesday, December 6, 2005 | 66A | Calculus symbol | Nancy Salomon |
| Sunday, February 15, 2004 | 107A | Standard deviation symbol (4) | Derrick Niederman |
| Saturday, January 3, 2004 | 5A | Standard deviation symbol (4) | James M. and James C. Jenista |
| Sunday, August 18, 2002 | 103D | ___ Society (super-high I.Q. group) | Michael Ashley |
| Wednesday, July 24, 2002 | 46D | Science society ___ Xi | Eric Berlin |
| Sunday, September 30, 2001 | 58D | Symbol of conductivity | Con Pederson |
| Sunday, July 15, 2001 | 29D | Standard deviation symbol (4) | Elizabeth C. Gorski |
| Saturday, December 2, 2000 | 52D | Fraternity letter | David J. Kahn |
| Tuesday, June 15, 1999 | 9A | ___ Alpha Epsilon fraternity | Stephanie Spadaccini |
| Tuesday, March 23, 1999 | 55A | Greek S (2) | Nathaniel Weiss |
| Monday, April 28, 1997 | 62A | Greek letter | Peter Gordon |
2 results for SIGMA from Variety puzzles.
| Date | Type | Grid | Clue | Author |
|---|---|---|---|---|
| September 19, 2010 | cryptic | 18A | Fraternity symbol, sign and map left incomplete (5) | Emily Cox & Henry Rathvon |
| August 6, 2000 | panda | 23A | Magi's character | Mel Taub |
8 results for SIGMA from older pre-Shortz puzzles.
| Date | Grid | Clue | Author | Editor |
|---|---|---|---|---|
| Thursday, August 1, 1991 | 25D | " . . . sweetheart of ___ Chi" | Eli Wesoff | Maleska |
| Monday, May 13, 1991 | 5A | Tau's predecessor | Arthur S. Verdesca | Maleska |
| Saturday, May 5, 1990 | 17A | Frat letter | Daniel Girardi | Maleska |
| Sunday, September 24, 1989 | 56D | Ess | Irene Smullyan | Maleska |
| Thursday, August 25, 1988 | 26D | Greek letter | William Canine | Maleska |
| Sunday, August 24, 1986 | 9A | "The Sweetheart of ___ Chi" | Arnold Moss | Maleska |
| Sunday, September 30, 1984 | 95A | Millesecond | Harriet Gilson Rosenberg | Maleska |
| Wednesday, July 25, 1984 | 41A | Greek letter | Whitten | Maleska |