Definition

1. Noun:
   • Sighting post, aiming post: A vertical rod or stake used as a fixed reference point for aiming or aligning, often in surveying, construction, or military contexts. It serves as a visual guide to establish a line of sight.
   • Surveyor's rod, ranging rod: A rod, often painted with alternating colors, used by surveyors to mark points and to sight lines for measurement.

Usage Examples

• Noun:
  • Người trắc địa cắm một cột ngắm để xác định đường thẳng. (The surveyor placed a sighting post to determine the straight line.)
  • Trong quân sự, cột ngắm giúp xạ thủ ngắm bắn chính xác hơn. (In the military, an aiming post helps the shooter aim more accurately.)

Advanced Usage

• "cắm cột ngắm": to set up/place a sighting post.
  • Trước khi đo đạc, chúng tôi phải cắm các cột ngắm dọc theo tuyến đường. (Before measuring, we must set up sighting posts along the route.)

Variants and Related Words

• Tiêu ngắm (n): A synonym often used interchangeably, meaning a sighting target or marker.
• Jalon (n): A French loanword used in technical Vietnamese, specifically meaning a surveyor's pole or ranging rod.

Synonyms

• Cọc tiêu: Stake, marker.
• Mốc ngắm: Aiming mark, benchmark.

Related Phrases

• Đường ngắm: Line of sight.
  • Cần giữ cho đường ngắm đi qua hai cột ngắm. (The line of sight must pass through the two aiming posts.)