Baseball (object)
From Memory Alpha, the free Star Trek reference
A baseball is a spherical object, used in the game it is named for. Measuring approximately 0.22 meters in circumference, and 140 grams in weight, it is made of a lightweight core with a leather outer, stitched together by 108 stitches of red cotton.
[edit] Sisko's baseball
In 2369, Benjamin Sisko received a baseball from an alien impersonating legendary baseball player Buck Bokai. He kept it on a stand in his office on Deep Space 9. He had previously kept a baseball with glove in his quarters. (DS9: "If Wishes Were Horses", "The Nagus")
During the initial phase of the Dominion War, after the Dominion temporarily gained control of Deep Space 9, the baseball was left behind, serving as a reminder to Dukat, who had taken command of the station, that Sisko intended to return. (DS9: "Call to Arms", "The Nagus") Sisko was given the ball back by Dukat following the latter's descent into madness, and the recapture of the station by Starfleet in Operation Return. (DS9: "Sacrifice of Angels")
In an alternate timeline Jake Sisko kept the baseball of his father in his house in Louisiana after his father's disappearance. (DS9: "The Visitor")
In 2374, following the sealing of the Bajoran wormhole by the Pah-wraiths, Sisko returned to Earth on leave. Kira Nerys noted that he took the baseball with him – a sign that Sisko was not sure that he would be returning. (DS9: "Tears of the Prophets")
The ball also helped Sisko locate the Orb of the Emissary on the planet Tyree three months later. In a vision sent to him by the Prophets, the ball rested at the location where Sisko was digging. When Ezri Dax took the ball from him on the surface, and threw it away, Sisko realized that the Orb was located where it fell. (DS9: "Image in the Sand", "Shadows and Symbols")
Sisko was given another baseball shortly thereafter, signed by the members of his senior staff in the Niners baseball team, after their game against the Logicians in 2375. (DS9: "Take Me Out to the Holosuite")
The baseball marked a symbolic passing of power at the end of that year – following Sisko's ascension to be with the Prophets, and Kira Nerys' promotion to station commander, she picked up the ball for the first time. The baseball also symbolized that Sisko was planning to return from the Prophets. (DS9: "What You Leave Behind")
