An Isolated Danger Mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate a hazard to shipping such as a partially submerged rock.
It is recognisable by its black and red bands and top-mark of two black balls.
Its distinctive sequence of flashing light consists of 2 quick flashes with intervals of 5 seconds.
Famous quotes containing the words isolated, danger and/or mark:
“Literature is not exhaustible, for the sufficient and simple reason that a single book is not. A book is not an isolated entity: it is a narration, an axis of innumerable narrations. One literature differs from another, either before or after it, not so much because of the text as for the manner in which it is read.”
—Jorge Luis Borges (1899–1986)
“The Government is able to afford a suitable army and a suitable navy. It may maintain them without the slightest danger to the Republic or the cause of free institutions, and fear of additional taxation ought not to change a proper policy in this regard.”
—William Howard Taft (1857–1930)
“I wander thro’ each charter’d street,
Near where the charter’d Thames does flow,
And mark in every face I meet
Marks of weakness, marks of woe.”
—William Blake (1757–1827)