The symbols have been known to police for several years, but have come to police attention again recently when they were spotted on a home in Walkden, Salford.
Greater Manchester Police said they carried out inquiries when one of the symbols appeared on the side of an elderly woman's home.
Chief Insp Sue Downey, of Greater Manchester Police, said: 'Police in Salford received a call from a woman in Walkden, who was concerned that a symbol had been marked on her house in chalk.
'Inquiries have been carried out and residents in the surrounding area have been spoken to, and we have received no further reports of any such activity.
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