Spotting an INTJ can be challenging as they often blend in with others due to their introverted nature. However, there are several key characteristics that can help you identify an INTJ:

1. Independent Thinkers: INTJs are known for their independent and original thinking. They have a strong desire to understand the world around them and often question established norms and beliefs. They are not easily swayed by popular opinions and prefer to form their own conclusions based on logical reasoning.

2. Strategic Planners: INTJs are natural strategists and are often seen planning and organizing their thoughts and actions. They have a long-term vision and are focused on achieving their goals. They are excellent at analyzing complex problems and finding efficient solutions.

3. Rational and Logical: INTJs rely heavily on logic and reason in their decision-making process. They are objective thinkers who prioritize facts and evidence over emotions. They are often seen as calm and composed individuals who approach situations with a rational mindset.

4. Introverted and Reserved: INTJs are introverts who prefer spending time alone or with a small group of close friends. They value their privacy and tend to keep their thoughts and emotions to themselves. They may appear reserved or distant in social situations, but once you get to know them, they can be engaging and insightful conversationalists.

5. Intense Focus: INTJs have a remarkable ability to concentrate deeply on a specific task or project. They are highly focused individuals who can work for long hours without getting distracted. They are driven by their desire for excellence and often strive for perfection in their work.

6. Direct and Assertive Communication: INTJs are known for their direct and straightforward communication style. They value efficiency and clarity in their interactions and may come across as blunt or insensitive to others. They prefer to get to the point quickly and appreciate others who do the same.

7. Skeptical and Critical Thinkers: INTJs have a natural inclination to question everything and are often skeptical of information presented to them. They have a keen eye for spotting inconsistencies and flaws in arguments or ideas. This critical thinking ability helps them make informed decisions and avoid being misled.

8. Visionary and Future-Oriented: INTJs are often described as visionaries who can see the bigger picture. They have a strong sense of purpose and are driven by their long-term goals. They enjoy exploring new ideas and possibilities and are always looking for ways to improve themselves and the world around them.

It's important to note that not all individuals will exhibit every characteristic mentioned above, and people can vary within the INTJ personality type. However, if you notice a person displaying a majority of these traits, there's a good chance they might be an INTJ.