I found the following: Could someone tell me what it means
No 118, 1781-09-15 pr 21.267 James Brownlee of Headlesscross seised Sept 13 1781 in part of Headlesscross and teinds, parish of cambusnethan, on disposition by William Storry of Badallan
It's an abbreviation of a Sasine from the Registers of Sasines for Lanarkshire. A Sasine is a record of a change of ownership of land.
Briefly, it tells you that William Storry of Badallan sold or gave part of Headlesscross to James Brownlee in 1781. The full sasine will have a lot more detail, including making it clear whether it was a sale or not, but much of it will be repetitious legal terminology.
William Storry of Badallan (b 1723) was my 4th great-grand-uncle. He inherited Badallan jointly with his brother Peter from their father Andrew Storry of Wester Braco and Paperthills. Peter had emigrated to the United States and William took on Peter's portion as well as his own. For some reason the Sasine transferring ownership from Andrew to his sons was not effected until 1758, nine years after Andrew's death. One of the witnesses to that sasine was James Brounlie, Tenant in Headlesscross of Badallan, and another was Robert Bryce, servant to the said James Brounlie.
Peter died some time before 1765, so it can't have been a need to realise Peter's portion that impelled William to transfer Headlesscross to James Brownlee in 1781.
It's all a bit complicated, actually. One of William's sons, Claud Storry (1770-1852) married Lilias Walker (c 1780-1862). Lilias' sister Jane Walker (c 1803-1892) married Alexander Brownlee (c 1801-1867), son of James Brownlee of Headlesscross and Martha Thomson. Another sister, Margaret Walker (c 1792-1879), married another Claud Storry (1792-1871) William's grandson by his son John, and yet another sister, Mary Walker (c 1789-1860), married Claud's brother John (1785-1878). The mother of these two brothers was Janet Thomson, but I do not know whether or not Janet Thomson was connected to Martha Thomson.